physics

A ball thrown horizontally at 13.0m/s from the roof of a building lands 21.4m from the base of the building. How tall is the building?

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  1. first do the horizontal problem with constant horizontal speed of 13 for 21.4 m to get time in air

    distance = speed * time
    t = 21.4 /13.0

    now we know it fell for time t

    h = (1/2) g t^2
    h = (1/2) (9.81) (21.4/13.0)^2 meters

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